{"id":66425,"date":"2024-10-14T17:25:17","date_gmt":"2024-10-14T09:25:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66425\/"},"modified":"2024-10-14T17:25:17","modified_gmt":"2024-10-14T09:25:17","slug":"mybatis-plus%e4%b9%8blambdaquerywrapper%ef%bc%8cwrappers-lambdaquery%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66425\/","title":{"rendered":"Mybatis-Plus\u4e4bLambdaQueryWrapper\uff0cWrappers.lambdaQuery\u7684\u4f7f\u7528"},"content":{"rendered":"<h1 id=\"mybatis-plus%e4%b9%8blambdaquerywrapper%ef%bc%8cwrappers-lambdaquery%e7%9a%84%e4%bd%bf%e7%94%a8-TyaSSuqSOL\">Mybatis-Plus\u4e4bLambdaQueryWrapper\uff0cWrappers.lambdaQuery\u7684\u4f7f\u7528<\/h1>\n<p>\u5728\u7576\u4eca\u7684Java\u958b\u767c\u4e2d\uff0cMybatis-Plus\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684ORM\u6846\u67b6\uff0c\u53d7\u5230\u4e86\u5ee3\u6cdb\u7684\u95dc\u6ce8\u3002\u5b83\u4e0d\u50c5\u7c21\u5316\u4e86\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u9084\u63d0\u4f9b\u4e86\u8a31\u591a\u4fbf\u6377\u7684\u529f\u80fd\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662fLambdaQueryWrapper\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eLambdaQueryWrapper\u7684\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u512a\u52e2\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%aflambdaquerywrapper%ef%bc%9f-TyaSSuqSOL\">\u4ec0\u9ebc\u662fLambdaQueryWrapper\uff1f<\/h2>\n<p>LambdaQueryWrapper\u662fMybatis-Plus\u63d0\u4f9b\u7684\u4e00\u500b\u67e5\u8a62\u689d\u4ef6\u69cb\u9020\u5668\uff0c\u65e8\u5728\u4ee5\u66f4\u7c21\u6f54\u7684\u65b9\u5f0f\u69cb\u5efa\u67e5\u8a62\u689d\u4ef6\u3002\u8207\u50b3\u7d71\u7684QueryWrapper\u76f8\u6bd4\uff0cLambdaQueryWrapper\u5229\u7528Java\u7684Lambda\u8868\u9054\u5f0f\uff0c\u4f7f\u5f97\u4ee3\u78bc\u66f4\u52a0\u6e05\u6670\u4e14\u6613\u65bc\u7dad\u8b77\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e4%bd%bf%e7%94%a8lambdaquerywrapper%ef%bc%9f-TyaSSuqSOL\">\u70ba\u4ec0\u9ebc\u4f7f\u7528LambdaQueryWrapper\uff1f<\/h2>\n<ul>\n<li><strong>\u985e\u578b\u5b89\u5168\uff1a<\/strong>\u4f7f\u7528Lambda\u8868\u9054\u5f0f\u53ef\u4ee5\u907f\u514d\u56e0\u70ba\u5b57\u7b26\u4e32\u62fc\u63a5\u800c\u5c0e\u81f4\u7684\u932f\u8aa4\uff0c\u56e0\u70ba\u7de8\u8b6f\u5668\u6703\u6aa2\u67e5\u8868\u9054\u5f0f\u7684\u6b63\u78ba\u6027\u3002<\/li>\n<li><strong>\u53ef\u8b80\u6027\u9ad8\uff1a<\/strong>\u4ee3\u78bc\u7d50\u69cb\u6e05\u6670\uff0c\u6613\u65bc\u7406\u89e3\uff0c\u7279\u5225\u662f\u5728\u8907\u96dc\u67e5\u8a62\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<li><strong>\u7c21\u5316\u4ee3\u78bc\uff1a<\/strong>\u6e1b\u5c11\u4e86\u6a23\u677f\u4ee3\u78bc\u7684\u7de8\u5beb\uff0c\u8b93\u958b\u767c\u8005\u80fd\u5920\u5c08\u6ce8\u65bc\u696d\u52d9\u908f\u8f2f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8lambdaquerywrapper%ef%bc%9f-TyaSSuqSOL\">\u5982\u4f55\u4f7f\u7528LambdaQueryWrapper\uff1f<\/h2>\n<p>\u4f7f\u7528LambdaQueryWrapper\u7684\u57fa\u672c\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n<pre><code>import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;\nimport com.example.entity.User;\nimport com.example.service.UserService;\n\n\/\/ \u5275\u5efaUserService\u7684\u5be6\u4f8b\nUserService userService = new UserService();\n\n\/\/ \u5275\u5efaLambdaQueryWrapper\nLambdaQueryWrapper&lt;User&gt; queryWrapper = new LambdaQueryWrapper&lt;&gt;();\n\n\/\/ \u6dfb\u52a0\u67e5\u8a62\u689d\u4ef6\nqueryWrapper.eq(User::getAge, 18)\n            .like(User::getName, \"John\");\n\n\/\/ \u57f7\u884c\u67e5\u8a62\nList&lt;User&gt; userList = userService.list(queryWrapper);\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5c0e\u5165\u4e86\u5fc5\u8981\u7684\u985e\uff0c\u7136\u5f8c\u5275\u5efa\u4e86\u4e00\u500bLambdaQueryWrapper\u7684\u5be6\u4f8b\u3002\u63a5\u8457\uff0c\u6211\u5011\u4f7f\u7528\u4e86`eq`\u548c`like`\u65b9\u6cd5\u4f86\u6dfb\u52a0\u67e5\u8a62\u689d\u4ef6\uff0c\u6700\u5f8c\u901a\u904e`userService.list(queryWrapper)`\u57f7\u884c\u67e5\u8a62\u3002<\/p>\n<h2 id=\"lambdaquerywrapper%e7%9a%84%e5%b8%b8%e7%94%a8%e6%96%b9%e6%b3%95-TyaSSuqSOL\">LambdaQueryWrapper\u7684\u5e38\u7528\u65b9\u6cd5<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684LambdaQueryWrapper\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong>eq\uff1a<\/strong>\u7b49\u65bc\u67e5\u8a62<\/li>\n<li><strong>ne\uff1a<\/strong>\u4e0d\u7b49\u65bc\u67e5\u8a62<\/li>\n<li><strong>gt\uff1a<\/strong>\u5927\u65bc\u67e5\u8a62<\/li>\n<li><strong>lt\uff1a<\/strong>\u5c0f\u65bc\u67e5\u8a62<\/li>\n<li><strong>like\uff1a<\/strong>\u6a21\u7cca\u67e5\u8a62<\/li>\n<li><strong>between\uff1a<\/strong>\u7bc4\u570d\u67e5\u8a62<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u93c8\u5f0f\u8abf\u7528\uff0c\u8b93\u67e5\u8a62\u689d\u4ef6\u7684\u69cb\u5efa\u8b8a\u5f97\u66f4\u52a0\u9748\u6d3b\u548c\u65b9\u4fbf\u3002<\/p>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%a1%88%e4%be%8b-TyaSSuqSOL\">\u5be6\u969b\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u4e26\u5e0c\u671b\u67e5\u8a62\u5e74\u9f61\u572818\u523025\u6b72\u4e4b\u9593\uff0c\u4e14\u540d\u5b57\u4e2d\u5305\u542b\u201cJohn\u201d\u7684\u7528\u6236\u3002\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>queryWrapper.ge(User::getAge, 18)\n            .le(User::getAge, 25)\n            .like(User::getName, \"John\");\n\nList&lt;User&gt; filteredUsers = userService.list(queryWrapper);\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u6e05\u6670\u5730\u8868\u9054\u4e86\u6211\u5011\u7684\u67e5\u8a62\u610f\u5716\uff0c\u4e26\u4e14\u6613\u65bc\u7dad\u8b77\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-TyaSSuqSOL\">\u7e3d\u7d50<\/h2>\n<p>LambdaQueryWrapper\u662fMybatis-Plus\u4e2d\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u5b83\u4e0d\u50c5\u63d0\u9ad8\u4e86\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\uff0c\u9084\u6e1b\u5c11\u4e86\u932f\u8aa4\u7684\u53ef\u80fd\u6027\u3002\u901a\u904e\u4f7f\u7528Lambda\u8868\u9054\u5f0f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u8f15\u9b06\u5730\u69cb\u5efa\u8907\u96dc\u7684\u67e5\u8a62\u689d\u4ef6\uff0c\u5f9e\u800c\u5c08\u6ce8\u65bc\u696d\u52d9\u908f\u8f2f\u7684\u5be6\u73fe\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u5730\u5340\u7684\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u9ad8\u6548\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Explore Mybatis-Plus&#8217;s LambdaQueryWrapper and learn how to effectively use Wrappers.lambdaQuery for streamlined database queries.<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-66425","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66425","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=66425"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66425\/revisions"}],"predecessor-version":[{"id":66426,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66425\/revisions\/66426"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}